IEC 62790:2020 RLV包含官方IEC国际标准及其红线版本。Redline版本不是官方文档，它只有英文版本，为您提供了一种快速简单的方法来比较IEC官方标准与其以前版本之间的所有变化。 IEC 62790:2020根据IEC 61140:2016的II类描述了用于光伏组件的高达1 500 V DC的接线盒的安全要求、结构要求和测试。 本文件也适用于安装在包含用于转换、控制、监测或类似操作的电子电路的PV模块上的外壳。考虑到光伏组件的环境条件，应用了有关相关操作的附加要求。本文件不适用于这些设备的电子电路，其他IEC标准适用于这些设备。这第二版取消并取代了2014年出版的第一版。与上一版相比，此版本包括以下重大技术变更: -对规范性参考文献、术语和定义的修改； -改进4.1中接线盒的类别声明； -4.1中环境温度的澄清； -在4.2中增加了提供有关RTE/RTI或TI信息的要求； -参考IEC 62930而不是4.6中的EN 50618； -在表1中添加“功能性绝缘”； -在表3中增加“通过水泥接缝的距离”； -更正4中物料组分类的工艺程序（删除PTI）。15.2.3; -4.16.1和4.16.2中绝缘部件的RTE/RTI或TI批准要求； -4.17.2中有关电化学电位要求的变更； -5.3.4.2中IP试验的澄清； -在5.3.6和5.3.16中增加了胶结接头的试验电压； -在5.3.9.1中增加了关于如何制备热循环试验用试样的详细描述； -根据IEC 61215-2:20 16的MQT 18.1的旁路二极管热测试（5.3.18）的新测试程序； -5.3.23中反向过载电流测试的新测试程序； -用于热循环测试的新图1。

IEC 62790:2020 RLV contains both the official IEC International Standard and its Redline version. The Redline version is not an official document, it is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition.

IEC 62790:2020 describes safety requirements, constructional requirements and tests for junction boxes up to 1 500 V DC for use on photovoltaic modules in accordance with class II of IEC 61140:2016.
This document applies also to enclosures mounted on PV-modules containing electronic circuits for converting, controlling, monitoring or similar operations. Additional requirements concerning the relevant operations are applied under consideration of the environmental conditions of the PV-modules. This document does not apply to the electronic circuits of these devices, for which other IEC standards apply. This second edition cancels and replaces the first edition published in 2014. This edition includes the following significant technical changes with respect to the previous edition:
- Modifications in normative references and terms and definitions;
- Improvement of declaration of categories for junction boxes in 4.1;
- Clarification for ambient temperature in 4.1;
- Addition of requirement to provide information concerning RTE/RTI or TI in 4.2;
- Reference to IEC 62930 instead of EN 50618 in 4.6;
- Addition of "Functional insulation" in Table 1;
- Addition of "Distance through cemented joints" in Table 3;
- Correction of procedure of process to categorize material groups (deletion of PTI) in 4.15.2.3;
- Requirement for approval of RTE/RTI or TI for insulation parts in 4.16.1 and 4.16.2;
- Change of requirements concerning electrochemical potential in 4.17.2;
- Clarification for IP-test in 5.3.4.2;
- Addition of test voltage for cemented joints in 5.3.6 and 5.3.16;
- Addition of detailled description on how to prepare the test sample for the thermal cycle test in 5.3.9.1;
- New test procedure for bypass diode thermal test (5.3.18) in accordance with MQT 18.1 of IEC 61215-2:2016;
- New test procedure for reverse overload current test in 5.3.23;
- New Figure 1 for thermal cycle test.